166536909 has 48 divisors (see below), whose sum is σ = 301916160. Its totient is φ = 85934880.

The previous prime is 166536899. The next prime is 166536917. The reversal of 166536909 is 909635661.

It is not a de Polignac number, because 166536909 - 2⁷ = 166536781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166536949) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115012 + ... + 116450.

It is an arithmetic number, because the mean of its divisors is an integer number (6289920).

Almost surely, 2^166536909 is an apocalyptic number.

It is an amenable number.

166536909 is a deficient number, since it is larger than the sum of its proper divisors (135379251).

166536909 is a wasteful number, since it uses less digits than its factorization.

166536909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 166536909 is about 12904.9180160123. The cubic root of 166536909 is about 550.1783542781.

The spelling of 166536909 in words is "one hundred sixty-six million, five hundred thirty-six thousand, nine hundred nine".